Charge forming device



July 18, 1933. F, D. FuNsToN CHARGE FORMING DEVICE Filed May 23, 1950 L a M o H .Il .ll 2 ERIM `as w u y a w ,J 2 3 4 2 n ,2f l@ 4 2 al wfmwaw .vl 4 J 5% S5/4..

UTIL

lllll$ w QQ ` lllllllllll/ ifi A Patented ,July l18,` 1933 ApplicationI filed Ma'y secondary mixing chamberor chambers, to be mixed with airtlierein unde1`"-certa1n 0p- Y ,erating conditions. j

Devices of tliis character areshown in the copending Aapplications of` Vilford `H.

T eeter, Serial No.28,8,685,4,fi1ed June 27, 1928,

and `Fred E.' Aseltine et al., iSei-ial No.V

370,179, filed June 12,1929. j

In the device disclosed in the` above-,inen- "tionedapplications, Vmeans have beenV pro'- vided for maintaining at the fuel inlets s`ubstantiallythe static suction of the air chain-vr ber which is controlled by a spring heldyair valve. It has been found, however, that be- "cause the passages ivhich'fconveyyaii" from the air chamber to the fuel inlets and-also communicate the-suction of the air chainbei' thereto, are of varyinglengths, and the' l i j y l j those particular elementsWhichcornprise,this

inlets thereof are' differently positioned with respect to'lthe incoming current of air, Vthe suction maintained at the not exactlyvthe same.

It is the object of thisinvention topro vide means for maintaining Lexactly the same degree of suction at ally of the fuelj inlets and exactly `the same vflow of fuel fromeachl of said inlets underfany` given operating conf` dition, preferably in'achargel-formingdevice in which substantially a static suction is maintained at the fuelinlets.

chamberto -the fuel jets and also conveyair,`

from said air chamber to the jets, said passages being of `exactly the same` length so lthat the air froins'aid air chamber" travelsv the saine distance before.` coming in contact with eachjvfuel inlet,the inlet ends roflsaid-i .passages also being arranged concentricaillyf the entering .air onthe inletiends of said pas? CHARGE FRMING' 4iiivicn j 2149504 `-Serial Nq. 454,917; f

' the; accompanying drawing Wherein'a 'prikl Z'Fsl 1.

No.370,179, and for this reason a specificl de#v different nozzles is v lwhich is ,adapted Qt'o.communicate-'With one in Figi.,

'to the-fuel Ainlets Aare foi-mefd,"jisf` secured j e "screws 26 to the bottomfof itheina'in' housing; 1

FREDERICK ki). FUNsToN, oF DAYTON, OHIO', 4AssnnicntTirollinneo@Renners{rientro-fig RATION, 0F DAYTON, OHIO, 4A conponn'rio'n oF DnLnwnnE '-v L.- f

sages and-the velocitykr of through all" i i of said passages is the saine;VAV l i 5 Further ob'ects" andV advantages`l fof'i'th pre'sei'itl 'invention will be apparent fromthe j following description, referencebeing had to ent invention is clearly shownfy f theidravving: i f e Y Figl lisa vertical 4'se'ctionthi'oughachargeiii) forming devi'ce constructed `vin accordance e withl the present invention and shovfv'ing.` one .1;

ferred embodiment fof 'oiieforniof the pres:`

outlet-branch of the manifold.` l j F'ig,"2 is a; section "onftheline 7 Fig. 3 is a fragmentary detail'sect'ion 's hov`7 ing the fuel passage leadingtothe"fiielfiiiletfs;` The present invention is: disclosed herein i as `en'ibo'died in the chargeformingfdevic of substantially the same v"general construcl ti'on asV is 4illustrated in application Serial scription of4 most of the structure .other thai invention or 4lare` directly with',havebeenomittedr` v .j y

The device comprisesaf main air n anifo'ld ofthe iiltale--portsl offa'i'multiscylinderven 'U' gine, the middlegbranch12being sho'vvnheref v` in. Thesebranchesareeach providedwvvith v an attaching flange; 14" foi-'1fy securingrthe. niarky ifoldto the engine block-'inthe usual manff ner'. `Adjacent itsinlet,thevmanifoldiszpro vided with aflange 16ste .which thecaijbure fj torv .unit is adapted-tribe secured-,Qasffsho'wn The carburetor unit'comprises' the'imainj housing 18,'whi'clrisfprovidedwithaflange,v 20 adapted to-be secured by Yscrews 23.*{126 the j iangenlfpAn airlinletcoupling22jisseg cured in anopeningfinthetop of thefh'ofus'f Y `ing in kany desirable manner,vvvhileja castirfigV 24 in which thefuel passages 1conveying :fuel Y a suitable `gasket being Y providedtto Y prevent f I leakage.v AsheetmetallfuelvbowlvQSyisheld W i :tight against a `flat surface lonfthe'inaiii -hoiis- VA,100.

in g byi ascreW l30, and fuel is` maintained ata substantiallyconstant level in the bowl by' .any conventional means( A plurality of angular priinarymixture Vdesc`ribed'-s"f Fuel is admitted to'these passages by Vmeans'hereinafter fully described,

is mixed with? air therein and :theA resultantf n i'ixture'conveyed through the mixture vsages and conduits formed in the manifold to the secondary mixing chambersformed'l j in the manifold outlet branches. vOne of sait conduitsv is ldisclosed. herein and comprises a Sheet metal tube. 36 Whieh east in posi tionin the manifold, this andthe otherpri-v mary mixture conduits associated with the end branches of theinanifold being of identi- .cal construction with those disclosed in application Serial No. 370,179. Y The primary mixture passagesare controlled'by asingle throttle valve 88, Whichextends across all ofthe passages and is provided With ygrooves L10,-Which register Vith said passages. The grooves 4() merge l"into smaller. groovesj42, Which are adapted to Vprovide passage for sullicient fuel to operate ,therengine When'idling, said grooves being open vvhen the throttle is in closed position.y

Allof the airadinitted to the air chamber 34 is suppliedth-rough the couplingQ and iscontrolled by aqvalvel: normally held against its seat 46 by Va spring 48 received betweenthevalve and a flange 50zprojectingfrom `a sleeve 52v slidably mountedon a'guide sleevelfly Whichis fixed in anydesirable Way inthe main' housing and guides-the air valve stem. 56. Under normal operating conditions, fthe sleeve 52 r.occupies the position the air'valve by a choke lever V58, which prog Jectsp-into the housingv beneath Ithe flange 50 l andlis VOperated bya mechanism fully shoivii inapplioation Serial No. 870,17 9. UV:The` valveA l/ladmits 'airj'to the chamber 84,-Wh.ieh communicates directly, With the prima-'ry'` mixture passages, as hereinbefore deseribed,and also supplies air kto asecondu the manifold inlet' andk is controlled by maninA Y Y ally and suction operatedvalves)J and'jG/'t,

'ary'.air passage 60, Whielrcommunieates with securedrto Vshaftst .and 68 respectivelyLv -.Theoperatingmeans Vfor thethrottle and t the above v'mentioned `valves is not-illustrated herein,=it beingsuflicient for the purposes of this disclosure to state 'that thervalve `62, isl adapted `to-be operated by'jthe primary throt-f tle`38,vbut the operating mechanism is lsolde-f' signed that the throttle has a certain independent vInove'nient toward its open'position `before' 'the'valve 62 begins toV move, this decalibratedY plugsl 88. 1 I The passages 8G arey parallel- 'iviththe'air valve stem and are arranged in the arc of a'.

the throttle moves beyond thisl position, the

throttle and the valve v'62 move siniultane-` ously, While the valve 64 is opened entirely' byengine suction and only subsequent to the opening of the valve 62.

Opening Vmovements of the valve temporarily retarded to prevent fluttering of` the valve and leaning of the mixture, by a dashpotcomprising a cylinder {Orforined in theeasting 24 and a pist-011,72, secured to the lower end -offthe valve stem in Vany desirable manner and operating Within the cylinder,

lThe suctionl operated lvalve-.6l is alsopro-` vided Witha dashpot `to:temporarily.retard its opening movements, thisdashpot and that describedbriefly above being of the vsame construction as fully disclosed in application Se- .el are" rial No". 370,179. All of the mechanism here.-. inbeforel referred to isA oldv in application Serial "No 370,l79, and, they,v improvement which constitutes the present invention, Will j ,now be (ilescribed in detail. This invention relates Vto the fuelzsupply `meansWhich coinprises a vertical fuel passage, 174' forin'edin a plate 76:, which isscrevved to the bottomof the casting. Fuel isadinitted tothe ypassage 7.2i at all times and kundei-all (iperatiiigconf, s Y v'ditioifisjbya fixed calibrated yplug 7 8 screwed into the castingQd horizontally, assliown inv 'F ig. 3, While at relatively highspeeds, addi-..

tional Lfuel is supplied to thefpassage'71l through the calibratedplug80, which is re!- ceived in the enlarged lovver end of such pas`- sage and through 'which the flow of fuel `controlled by valve which is shownv in application Serial No. 870,179. 4 The -passagel Vieri 'i connects at its upperaendwvitli a `fiielchannel 82, lformed inthe top surface of the casting 2l' and communicating elirectly ivithlthree fuel' inlets 84, which supplyfuel atidling directly tothemixture passages and three vertical fuel passages86 through Which fuel is "supplied to the mixture passages under all` other .operatingY conditions, the admission of fuel to' themiassafres 86 beine' controlled Vbv f 1 D D y u circle which is concenetric vvhcreby'such pasverticalpassage :92. Each passage 92 coininunicates vatV its lower endA with fuel supply orifice 94, Which.'communicates'directly With horizontal passage 90', which connectsl Witha,

vthe"associated primary mixture 'passageythe orifice being of much smaller sizethan-either f "of the'v passages 8 8 and .90, as shown vinFig. l, Sagree 0f m0vement, being generally such as toy The passages V90 are supplied With'air 'from Q9 ""of said Lmixture passages, an arcuate slot ad-l mitting airto said fuel passages` and :a plu-v rality of fuel feeding orifices communicating l, With said fuel passages' and arranged inthe arc of va .circle concentric with said arcuate 7, A charge forming device.l for ,internal combustion engines comprising aiplurality of separate primary mixture passages adapted to supply'a primary mixture of air land fuel to a plurality ofvseparate secondary mixing chambers, an air chamber supplyin'gair to all of said primarymixture passages,ia Yfuel feeding'oriiiceineach of said .mixtureV passages, fuel passages leading from a source of fuel supplyA to each ofsaidfuelifeeding orifices, passages conveying airfrom. the air fchamber to said fuelpassages, the inlet ends of said air supply passagesbeingthesame distance fromthe fueljfeeding orifices. v y

8. AQ chargeformiiigY device l`for internal s vcombustion engines comprising al plurality Y of primaryV mixture passages adapted ,to supypIyaprimary mixture ofair and. fuel. toa plurality of secondarymixing chambers, an air chamber supplying yair toall of'said primary mixture passages, a fuel feeding orifice in each of said'v mixture passages, fuelpassages leading Yfrom a vsourceof fuelsupply` toieach oflsaid fuelfeeding orifices, and pasvsages of'larger size than the fuelV feeding orifices for conveying air to .the fuel` passages, f vwhereby thestaticsuctionof theair'chamber is communicated to'said fuel passages, the

iiile'tzeiids of said Vairy supply passages being thesame distance from ther-fuel feeding orifices..V p i v v 9. Ay V'chargeforming device for internal Vcombustion engines comprising a plurality of Vprimary mixturepassages adapted to supply a primary mixture of air and fuelto a plu- Y Y-ralityofmsecondaryzmixing chambers, au .air

y chamber' supplying air to allof said primaryv mixture passagesan air., valvecontrollingthe' admission of air to said-chamber, a fuelfeeding' `orifice .in eacli Vof said ymixture passages,

A 'l fuel passages leadingY from asourceoffuel supply tosaid fuel'feediiig. orifices, andan arcuate sl-otivhich is concentrievvith `the pe- .riphery of the air valve, for admitting air to` fall of'said Vfuel passages.vv

l0. charge forming primary mixture of Vair and fuel to a plurality vof secondary mixing chambers, an air cham- A ber! supplying air to allrof said primary mix- -tur'e passages, an -air` valve controlling the admission ofairtosaid chamber, afuel feeding orifice in each ofsaid-mixture passages,

said orifices beiiigarranged inan'arc'v concen-` Y, tricivith the periphery ofthe air valve, fuel passages leading Afroma source of fuelsupply to said orifices, and an arcuate slot for admitting air to said fuelpassages,said slot devicefor internal Y Y L'ombustion enginescomprising a plurality of primarymixture passages adapted to supply a also being concentricy with fthe .periphery of said air valve. l

Y 11.A charge forming device internal Y* combustion engines comprising a plurality of primary mixture passages adaptedfto supply a primary mixture of air and'fuel to a' plurality of secondary-mixing chambers,i an air ,chamber supplying-air to allofsaid primary mixture passages, an air valve controlling the admission ofy airl to said air chamber, a

plurality of fuelV passages substantially 'par-f allel to the path ofl air entering the air chamber and ythrough vwhich fuel -liows Vinfa direc-` tion opposite to that of the entering air, andi 'air supply means. also Aarranged in yanfarc 1 Aconcentric ywith the periphery of; the vairivalve toV supply air to'mix vvith the fuel issuing fromsaid fuel passages, whereby thev impact of the entering air on .the delivery end of each fuel passage is'the same.

l2. charge-forming device 'for internal combustionengiiies comprising apluralitysofk primary mixture passages adapted vtopsupply a primary mixture ofv air and fuel to a plurality f of .secondary mixing chambers, an air chamber supplyiiigair Jto rall of said primary j mixture passages, an air valve Ycoiitrolling-the ,admission of airto-said air chamber,a plu- "rality offuel passages substantiallyV parallel i to theV path. of air enteringtheiair chamber and through `which fuel flows in avpdirection Loppositeto that` .of -the entering air,raiid an arcuate slot substantially in valignment with Y said fuel passages andadmittingfairto With the fuel issuing therefrom, said slot lyfing .in an are concentric .with the periphery.

icc

of thelair valve Wherebythe'impact of the entering air on the deliveryfend of each fuel passage is the same. s

13. A charge forming device for internal primary' mixture passages adapted lto supply 105 Y combustion engines comprising a plurality of a primarymixture of air an d'fuel to a plural- Y ity 'of secondary mixing -chambers, fan air chamber supplying air-'to allof saidV primary Ymixture passages, an air valve controlling the admission of to said air chamber, a 'plurality of fuel passages substantially parallel to the' path of -air enteringrthe. air chamber and through which fuelsV flows in a direction iis opposite' to thatof the entering air, an arcuate slot substantiallyV in alignment With said` fuel passages and admitting air to mix With the fuel issuing therefrom, said slot lying in an arc concentric With theperiphe'ry of the air'valve whereby the impact of .the entering air on the delivery,fendfof each fi'ielpassage is the same, and a shieldover the slot for min-A imizing the effect of impact.

Vlll, A charge` forming device for internalk combustion engines comprising a plurality I of primary mixture passages Y*adapted to sup-k ply a primary mixture of'airqand fuel .tov-a plurality ofseconda-ry mixing chambers, an `Vairchambersupplying air to all of said prip mary mixture passages, an air valve control;

ling the admission of air to said air chamber,

a plurality of fuel passages substantially paire' allel tothe path of air entering the air cham#vv ber and through which fuel flows in al direction opposite to that of the entering air,'an' arcuate slot substantially in alignment with' said fuel passages and admitting. air vto miXWith the fuel issuing therefrom, said slot lying in an varc concentric with the` periphery of the i air valve whereby,` the .impact of the enteringv i air on the `delivery end` of eaclry fuel 4passage is the same, a Vfuel'feeding o'riliceineach mix-v ture passage-and passages conveying an emuli' e sion ,ofy fuel and air from the ends of said'fv fuel passages to the fuel yfeeding orifices, said` orifices being also in an arc-concentric With the peripherylof the air valve, wherebythe,

fuel emulsion travels thesame distance to each` a fuel feeding'orice.

FREDERiCKn .FUNsToQ i," 

